part vs portion

part and portion both are nouns.

Word	Noun	Adjective	Verb	Adverb
part	Yes	No	Yes	Yes
portion	Yes	No	Yes	No

As nouns, part and portion are synonyms defined as:

As nouns, part and portion are synonyms defined as:

part and portion: assets belonging to or due to or contributed by an individual person or group

Other synonyms of part include percentage, share.

As nouns, part and portion are synonyms defined as:

part and portion: something determined in relation to something that includes it

Other synonyms of part include component, component part, constituent.

part (noun)	portion (noun)
the actions and activities assigned to or required or expected of a person or group	the allotment of some amount by dividing something
the effort contributed by a person in bringing about a result	something less than the whole of a human artifact
something less than the whole of a human artifact	an individual quantity of food or drink taken as part of a meal
an item that is an instance of some type	assets belonging to or due to or contributed by an individual person or group
a line of scalp that can be seen when sections of hair are combed in opposite directions	money or property brought by a woman to her husband at marriage
one of the portions into which something is regarded as divided and which together constitute a whole	something determined in relation to something that includes it
an actor's portrayal of someone in a play	your overall circumstances or condition in life (including everything that happens to you)
that which concerns a person with regard to a particular role or situation
the melody carried by a particular voice or instrument in polyphonic music
the extended spatial location of something
a portion of a natural object
assets belonging to or due to or contributed by an individual person or group
something determined in relation to something that includes it

part (verb)	portion (verb)
move or break apart	give out
force, take, or pull apart
depart for someplace
go one's own way; move apart
discontinue an association or relation; go different ways

part (adverb)	portion (adverb)
to some extent; in some degree; not wholly